I am traveling to Vietnam, Cambodia and Thailand. I am struggling to find proper information about the requirement of registration. I know hotels register you automatically but I plan to stay at Homestays advertised on Booking.com, and I am not sure if these count as hotels, and if they will register me. In addition, I plan to stay in a Thai kickboxing camp in Thailand too.
In a rare scenario if they refuse, what are my possible options if the law demands that I should be registered?